Re: idle rpm for merc 150
It's a good idea to go ahead and check out the link n sync. If you set it up right, Idle will probably fall in very close, and a small adjustment of the idle stop screw drops it in.
I bought an 18 year old Black Max that had been the victim of quick fixes for years. When I got it timed up right, fuel mileage increased dramatically, as did power. The throttle cable was close to 1/2 inch off, couldn't even be hooked up without major adjustment.
hope it helps
John